21014452431 has 32 divisors (see below), whose sum is σ = 35586777600. Its totient is φ = 12005979840.

The previous prime is 21014452387. The next prime is 21014452451. The reversal of 21014452431 is 13425441012.

21014452431 is a `hidden beast` number, since 2 + 101 + 4 + 4 + 524 + 31 = 666.

It is not a de Polignac number, because 21014452431 - 2⁶ = 21014452367 is a prime.

It is a super-2 number, since 2×21014452431² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21014452395 and 21014452404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014452451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1924435 + ... + 1935323.

It is an arithmetic number, because the mean of its divisors is an integer number (1112086800).

Almost surely, 2^21014452431 is an apocalyptic number.

21014452431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21014452431 is a deficient number, since it is larger than the sum of its proper divisors (14572325169).

21014452431 is a wasteful number, since it uses less digits than its factorization.

21014452431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21116 (or 21110 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 21014452431 its reverse (13425441012), we get a palindrome (34439893443).

The spelling of 21014452431 in words is "twenty-one billion, fourteen million, four hundred fifty-two thousand, four hundred thirty-one".